﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
namespace XiongSJ.Framework.Common
{
    public static class CommonHelper
    {
        /// <summary>
        /// 获取枚举的描述
        /// </summary>
        /// <param name="enumValue"></param>
        /// <returns></returns>
        public static string GetEnumDescription(Enum enumValue)
        {
            string str = enumValue.ToString();
            System.Reflection.FieldInfo field = enumValue.GetType().GetField(str);
            object[] objs = field.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
            if (objs == null || objs.Length == 0) return str;
            System.ComponentModel.DescriptionAttribute da = (System.ComponentModel.DescriptionAttribute)objs[0];
            return da.Description;
        }

        /// <summary>
        /// 获取客户端IP地址
        /// </summary>
        /// <returns>若失败则返回回送地址</returns>
        public static string GetIP()
        {
            //如果客户端使用了代理服务器，则利用HTTP_X_FORWARDED_FOR找到客户端IP地址
            string userHostAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().Split(',')[0].Trim();
            //否则直接读取REMOTE_ADDR获取客户端IP地址
            if (string.IsNullOrEmpty(userHostAddress))
            {
                userHostAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }
            //前两者均失败，则利用Request.UserHostAddress属性获取IP地址，但此时无法确定该IP是客户端IP还是代理IP
            if (string.IsNullOrEmpty(userHostAddress))
            {
                userHostAddress = HttpContext.Current.Request.UserHostAddress;
            }
            //最后判断获取是否成功，并检查IP地址的格式（检查其格式非常重要）
            if (!string.IsNullOrEmpty(userHostAddress) && IsIP(userHostAddress))
            {
                return userHostAddress;
            }
            return "127.0.0.1";
        }

        /// <summary>
        /// 检查IP地址格式
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static bool IsIP(string ip)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
        }

        /// <summary>
        /// 获取客户端IP地址（无视代理）
        /// </summary>
        /// <returns>若失败则返回回送地址</returns>
        public static string GetHostAddress()
        {
            string userHostAddress = HttpContext.Current.Request.UserHostAddress;

            if (string.IsNullOrEmpty(userHostAddress))
            {
                userHostAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }

            //最后判断获取是否成功，并检查IP地址的格式（检查其格式非常重要）
            if (!string.IsNullOrEmpty(userHostAddress) && IsIP(userHostAddress))
            {
                return userHostAddress;
            }
            return "127.0.0.1";
        }
    }
}
